Determination of optical properties by measuring laser-induced acoustic transients

Monika Kirschner; Guenther Paltauf; Heinz Schmidt-Kloiber

doi:10.1117/12.259949

26 November 1996 Determination of optical properties by measuring laser-induced acoustic transients

Monika Kirschner, Guenther Paltauf, Heinz Schmidt-Kloiber

Proceedings Volume 2928, Biomedical Systems and Technologies; (1996) https://doi.org/10.1117/12.259949
Event: BiOS Europe '96, 1996, Vienna, Austria

Abstract

Time resolved measuring of laser induced acoustic transients is a good possibility for the determination of optical properties of tissue and tissue like samples. Laser radiation with perpendicular incidence upon the sample-air boundary causes a thermoelastic pressure distribution, which corresponds to the distribution of the absorbed energy in the sample. The knowledge of this distribution allows the determination of optical parameters. Acoustic transients are measured with an aluminum coated film of polyvinylidene fluoride (25 micrometers thickness). The geometric dimensions of the experimental set-up, such as the laser beam diameter, radial profile of the laser beam, penetration depth of radiation, position and size of the sensors are significantly influencing the profile of the measured transients. By using samples consisting of layers with different absorption coefficients, we can analyze the influence of diffraction on the profile of the acoustic signal. For simple geometric configurations it is possible to calculate the thermoelastic wave analytically, but for arbitrary configurations we are using a numerical procedure. The experimental results are qualitatively in good coincidence with our calculations.

Citation Download Citation

Monika Kirschner, Guenther Paltauf, and Heinz Schmidt-Kloiber "Determination of optical properties by measuring laser-induced acoustic transients", Proc. SPIE 2928, Biomedical Systems and Technologies, (26 November 1996); https://doi.org/10.1117/12.259949

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available